There are a lot of X1/9 hill climb cars in action on the Tube. Some clearly have motorcycle engines (extreme rpm and sequential shifters).
They all seem to have massive wings on the back.
I know I read somewhere that the massive wing on at least one X1/9 was more for smoothing out the airflow for the abruptly chopped rear end than for downforce. I guess it would depend what you were planning to do with the car.
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